Damien1972 writes: Humans are not alone in experiencing a mid-life crisis — great apes suffer the same, according to new research in the Proceedings of the National Academy of Sciences. A new study of over 500 great apes found that well-being patterns in primates are similar to those experience by humans. This doesn't mean that middle age apes seek out the sportiest trees or hit-on younger apes inappropriately, but rather that their well-being starts high in youth, dips in middle age, and rises again in old age.